A visitor touring Mammoth Cave died while on a cave tour on Wednesday afternoon. William Martin, 67, of Bronson, Florida, was on the 11 a.m. historic cave tour when he became ill in River Hall, about a mile and a half into the two-mile tour. The tour guides telephoned their supervisor on the surface for assistance and immediately began CPR. Rangers administered CPR and applied an AED, but without success. Park personnel and Edmonson County EMS personnel assisted in the incident.